This error appears to be due to Steam's recent change in currency for Brazilian users. We do not currently have an ETA for a fix, however, you should still be able to purchase EP with Microsoft Points if you uninstall through Steam and install through the Games for Windows Marketplace.

Even though we have moved from the production to the support phase, we are still supporting the community and the servers. You can still continue to play the game as usual. There just won't be any new content.

Also, for brazilians players buy EP from steam, they have to send that ticket?

No, the current servers will remain available. We are still investigating the issue of EP purchasing issues for Brazilian players. If you would like to contact us directly concerning this, you can submit a ticket.